Mechanical shim is an advanced technology for reactor power and axial offset control with control rod assemblies. To address the adverse accuracy impact on the ex-core power range neutron flux measurements-based axial offset control resulting from the variable positions of control rod assemblies, the lead-lag-compensated in-core self-powered vanadium detector signals are utilized. | Research on mechanical shim application with compensated prompt current of vanadium detectors N u c l e a r E n g i n e e r i n g a n d T e c h n o l o g y 4 9 ( 2 0 1 7 ) 1 4 1 e1 4 7 Available online at ScienceDirect Nuclear Engineering and Technology journal homepage: Original Article Research on Mechanical Shim Application with Compensated Prompt g Current of Vanadium Detectors Zhi Xu Suzhou Nuclear Power Research Institute, Xihuan Road 1788, Suzhou, Jiangsu 215004, PR China article info abstract Article history: Mechanical shim is an advanced technology for reactor power and axial offset control with Received 30 March 2016 control rod assemblies. To address the adverse accuracy impact on the ex-core power Received in revised form range neutron flux measurements-based axial offset control resulting from the variable 19 August 2016 positions of control rod assemblies, the lead-lag-compensated in-core self-powered va- Accepted 22 August 2016 nadium detector signals are utilized. The prompt g current of self-powered detector is Available online 13 October 2016 ignored normally due to its weakness compared with the delayed b current, although it promptly reflects the flux change of the core. Based on the features of the prompt g current, Keywords: a method for configuration of the lead-lag dynamic compensator is proposed. The simu- Lead Lag lations indicate that the method can improve dynamic response significantly with negli- Mechanical Shim gible adverse effects on the steady response. The robustness of the design implies that the Prompt g Current method is of great value for engineering applications. Response Time Copyright © 2016, Published by Elsevier Korea LLC on behalf of Korean Nuclear Society. This Robust is an open access article under the CC BY-NC-ND license ( Sensitivity licenses/by-nc-nd/). Vanadium Detectors 1. Introduction Without
